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SUBSEQUENT EVENTS (2.0% Convertible Note Due 2025) (Details)
$ / shares in Units, $ in Thousands
1 Months Ended
Feb. 29, 2020
USD ($)
$ / shares
shares
Oct. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Cash available for general corporate purposes   $ 527,500 $ 492,500
Subsequent Event [Member]      
Debt Instrument [Line Items]      
Cash available for general corporate purposes $ 393,500    
2.0% Convertible Senior Notes Due 2025 [Member] | Subsequent Event [Member]      
Debt Instrument [Line Items]      
Face amount $ 400,000    
Interest rate, stated percentage 2.00%    
Payment of estimated fees $ 6,500    
Conversion ratio 0.0094469    
Conversion premium 50.00%    
Last reported sale price used to calculate conversion premium | $ / shares $ 70.57    
Maximum number of shares issuable upon conversion | shares 3,800,000    
2.0% Convertible Senior Notes Due 2025 [Member] | Redemption, Defined Changes of Control [Member] | Subsequent Event [Member]      
Debt Instrument [Line Items]      
Redemption price, percentage 100.00%    
2.0% Convertible Senior Notes Due 2025 [Member] | Redemption, Redeem For Cash [Member] | Subsequent Event [Member]      
Debt Instrument [Line Items]      
Redemption price, percentage 100.00%